Approach controller vectoring an small transport for approach to runway 8 had less than standard separation with another small transport on the ILS for runway 31.

Home

Browse by month

Random

Latest

About

Contact

Attributes
ACN	132729
Time
Date	198912
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : bis
State Reference	ND
Altitude	msl bound lower : 3500 msl bound upper : 4300
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : bis tower : sna
Operator	general aviation : corporate
Make Model Name	Small Transport, Low Wing, 2 Turboprop Eng
Flight Phase	cruise other
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Make Model Name	Small Transport, Low Wing, 2 Recip Eng
Flight Phase	descent other
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
ASRS Report	132729
Person 2
Affiliation	Other
Function	flight crew : captain oversight : pic
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	conflict : airborne less severe non adherence : required legal separation
Independent Detector	atc equipment other atc equipment : unspecified other controllera
Resolutory Action	other
Consequence	Other
Miss Distance	horizontal : 12000 vertical : 800
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Small transport X was cleared for an ILS runway 31 approach 6 mi southeast. Small transport Y was being vectored for the ILS 8 sse of the airport behind small transport X. When small transport Y was given a vector for the left downwind for the ILS, he came within 3 mi of small transport X who was presently 6 mi on final on the localizer at 3500' MSL. Small transport Y at the same moment was instructed by the approach controller to descend out of 4500' MSL to 3500' MSL -- so they were also less than a thousand feet. Small transport Y was issued a heading away from small transport X which they pass each other by 2 mi. No traffic information issued at all.

Original NASA ASRS Text

Title: APCH CTLR VECTORING AN SMT FOR APCH TO RWY 8 HAD LESS THAN STANDARD SEPARATION WITH ANOTHER SMT ON THE ILS FOR RWY 31.

Narrative: SMT X WAS CLRED FOR AN ILS RWY 31 APCH 6 MI SE. SMT Y WAS BEING VECTORED FOR THE ILS 8 SSE OF THE ARPT BEHIND SMT X. WHEN SMT Y WAS GIVEN A VECTOR FOR THE LEFT DOWNWIND FOR THE ILS, HE CAME WITHIN 3 MI OF SMT X WHO WAS PRESENTLY 6 MI ON FINAL ON THE LOC AT 3500' MSL. SMT Y AT THE SAME MOMENT WAS INSTRUCTED BY THE APCH CTLR TO DSND OUT OF 4500' MSL TO 3500' MSL -- SO THEY WERE ALSO LESS THAN A THOUSAND FEET. SMT Y WAS ISSUED A HDG AWAY FROM SMT X WHICH THEY PASS EACH OTHER BY 2 MI. NO TFC INFO ISSUED AT ALL.

Data retrieved from NASA's ASRS site as of August 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.